PANG Riquan, WEI Li, TAN Wen, ZHANG Manbo

（Department of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110168 )

Abstract: Foamed ceramics was prepared by the foaming method, and the expansion and the kinetics mechanism of the foamed body were investigated during the process. The volume -time curve of the foaming body was obtained through the experiment. The result indicates that the foam body expansion has gone through three steps. The volume of foam ceramics slowly enlarges at the initial stage, then expands rapidly to the largest extent, and begins contracting，but the volume stays at a fixed dimension finally. The analysis on the basis of kinetics mechanism shows that foam body expansion has direct relation with the quantity of the gas that is decomposed from the foaming agent and capacitied from the melt. This kinetic equation on the expanded volume and the foaming time was deduced, which provides the theory basis for controlling the foaming process.

Key words: foaming method, foamed ceramics, foaming, kinetics mechanism